synchronized
In
Metro
or
Global
Mirror,
the
status
condition
that
exists
when
both
virtual
disks
(VDisks)
of
a
pair
that
has
a
copy
relationship
contain
the
same
data.
system
A
functional
unit,
consisting
of
one
or
more
computers
and
associated
software,
that
uses
common
storage
for
all
or
part
of
a
program
and
also
for
all
or
part
of
the
data
necessary
for
the
execution
of
the
program.
A
computer
system
can
be
a
stand-alone
unit,
or
it
can
consist
of
multiple
connected
units.
T
terabyte
In
decimal
notation,
1
099
511
628
000
bytes.
topology
The
logical
layout
of
the
components
of
a
computer
system
or
network
and
their
interconnections.
Topology
deals
with
questions
of
what
components
are
directly
connected
to
other
components
from
the
standpoint
of
being
able
to
communicate.
It
does
not
deal
with
questions
of
physical
location
of
components
or
interconnecting
cables.
(S)
IBM
TotalStorage
Enterprise
Storage
Server
(ESS)
An
IBM
product
that
provides
an
intelligent
disk-storage
subsystem
across
an
enterprise.
trigger
To
initiate
or
reinitiate
copying
between
a
pair
of
virtual
disks
(VDisks)
that
have
a
copy
relationship.
U
UID
See
unique
identifier
.
unconfigured
mode
A
mode
in
which
I/O
operations
cannot
be
performed.
See
also
image
mode
and
managed
space
mode
.
uninterruptible
power
supply
(UPS)
A
device
that
is
connected
between
a
computer
and
its
power
source
that
protects
the
computer
against
blackouts,
brownouts,
and
power
surges.
The
uninterruptible
power
supply
contains
a
power
sensor
to
monitor
the
supply
and
a
battery
to
provide
power
until
an
orderly
shutdown
of
the
system
can
be
performed.
unique
identifier
(UID)
An
identifier
that
is
assigned
to
storage
system
logical
units
when
they
are
created.
It
is
used
to
identify
the
logical
unit
regardless
of
the
logical
unit
number
(LUN),
status
of
the
logical
unit,
or
whether
alternate
paths
exist
to
the
same
device.
Typically,
a
UID
is
only
used
once.
unmanaged
An
access
mode
that
pertains
to
a
managed
disk
(MDisk)
that
is
not
used
by
the
cluster.
UPS
See
uninterruptible
power
supply
.
182
IBM
System
Storage
SAN
Volume
Controller:
Hardware
Installation
Guide
Summary of Contents for 2145UPS-1U
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